array_diff_assoc
(PHP 4 >= 4.3.0, PHP 5)
array_diff_assoc — Computes the difference of arrays with additional index check
Description
Compares array1 against array2 and returns the difference. Unlike array_diff() the array keys are used in the comparison.
Parameters
- array1
-
The array to compare from
- array2
-
An array to compare against
- ...
-
More arrays to compare against
Return Values
Returns an array containing all the values from array1 that are not present in any of the other arrays.
Examples
Example #1 array_diff_assoc() example
In this example you see the "a" => "green" pair is present in both arrays and thus it is not in the output from the function. Unlike this, the pair 0 => "red" is in the output because in the second argument "red" has key which is 1.
<?php
$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "yellow", "red");
$result = array_diff_assoc($array1, $array2);
print_r($result);
?>
The above example will output:
Array
(
[b] => brown
[c] => blue
[0] => red
)
Example #2 array_diff_assoc() example
Two values from key => value pairs are considered equal only if (string) $elem1 === (string) $elem2 . In other words a strict check takes place so the string representations must be the same.
<?php
$array1 = array(0, 1, 2);
$array2 = array("00", "01", "2");
$result = array_diff_assoc($array1, $array2);
print_r($result);
?>
The above example will output:
Array
(
[0] => 0
[1] => 1
)
Notes
Note: This function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using, for example, array_diff_assoc($array1[0], $array2[0]);.
See Also
- array_diff() - Computes the difference of arrays
- array_intersect() - Computes the intersection of arrays
- array_intersect_assoc() - Computes the intersection of arrays with additional index check